Ronstan RF55111 Series 55 Single OrbitBlock

Ronstan RF55111 Series 55 Single OrbitBlock

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Ronstan RF55111 Series 55 Single OrbitBlock, Dyneema® Link Head and Becket. Ultra lightweight with low friction two-stage orbital ball bearing system. Highest working load in its class whilst being low profile and compact. High performance cleating, easily fitted and securely retained Dyneema® Link head. Ultra low profile becket.

Suitable for mainsheet systems on dinghies, sports boats and small keep boats up to 9m. Halyard, vang and backstay applications on boats uo to 8m and control line applications on larger yachts.

High compression strength carbon black Acetal ball bearings, carbon fibre reinforced Nylon two stage bearing system. Toughened glass fibre reinforced Nylon frame and cheeks. U.V. stabilised, multi-strand impregnated SK75 Dyneema® Rope Link.

Sheave Ø 55 mm
Max. Rope Ø 10 mm
Max. Cable Ø - mm
Pin Ø - mm
M.W.L. 500 kg
B. L. 1000 kg
Weight 75 g

After ordering online, you will receive an automated email confirmation containing your order details. Your order will then be confirmed within a few minutes of placing your order.

It is our policy to ensure we deliver to our customers in a timely manner. In order to achieve this we use a range of freight companies depending on the size and weight of your order. In some instances we may use a number of carriers to get your products to you. For example, chain may come by road, some electronic equipment by air.

Most orders are shipped within 2 - 5 Days

Shipping rates

Orders delivered to Australian Post Codes under $399 attract an $15.00 shipping charge.

Orders of $399 or more ship free.* Excludes Bulky Or Dangerous Goods

For Remote areas and bulky items. If the cost to send is vastly different to our standard delivery costs, someone from our team will contact you prior to dispatch to arrange further payment or to issue a refund if you are not happy with the additional charges.

International orders will be charged at $0.00 initially and our staff will be in contact with a shipping quote. If the quote is not accepted the customer reserves the right to cancel their order and be refunded in full.

Should you have any queries or concerns about shipping, please don't hesitate to get in touch by clicking the support button on bottom right of the page.

What Our Customer Say

i ordered 6 port holes and these guys found exactly what i needed and went out of there way so much to help me 5 star service .


Prompt shipping and a good price. Item was well packed and arrived as ordered and undamaged. Thanks

Tom Mercer

Good quality parts easy to order on downside a couple of delays but they were quick to call and let me know

Darcy Scholte

Good service. Parts delivered on time and in good condition. There was a bit of mix up with one of my first orders but very promptly sorted and sent our to...


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